7th International Conference on Multiphase Flow, ICMF 2010
Extensive validation of computational fluid dynamics (CFD) models is required when modeling biomass fluidization, because several required model inputs are not know or not easily measured experimentally for biomass. In the present work, CFD fluidization modeling of a biomass bed is validated by comparison with X-ray computed tomography experimental data. A parametric study was carried out by employing ground walnut shell or ground corncob as model biomass bed materials, and fluidization was performed at a gas velocity twice the minimum fluidization velocity. An important result is the use of an "effective density" for biomass in the CFD model, the use of which is necessary because the biomass particles can be characterized by an irregular shape and some degree of porosity, whereas CFD models assume the biomass particles to be solid spheres. If the mid-value of the density range provided by the manufacturer is employed, the bulk density of the solid phase in the bed is overestimated. The results also suggest that the value of COR has a negligible effect on the predictions for biomass systems.
Gavi, Emmanuela; Heindel, Theodore J.; and Fox, Rodney O., "Modeling fluidization in biomass gasification processes" (2010). Chemical and Biological Engineering Conference Presentations and Proceedings. 8.